Improvement in mill-spindle drivers



`To all whom it may concern:

w llliil tant parte ceppi.

.e Jaune u. LOGAN, or SPRINGFIELD, .ILLrNoIs Leners Patent No. 103,211, dated May 17, 187e.

l IMPRovEMEivT IN MILL-SPINDLE DRIVERS.

` The Schedulerefen'ed to. in these Letters Patent :md making pax'c of the sama.

B Yit known that` I, Y.Linus M. LOGAN, of Springi l ieldpin the county ofSangamon and in the State oflllinois, have inventeda new a'nd. useful Improved p y Mill-spindle Driver;` and dodiereby declare that the l following isa fullpclealgaud exact description thereof, reference being had to the accompanying drawing making a part of `this specication, in which- Figure l 1s a plan viewfof the upper side of my improvement, with aportion of one of the spring-boxes broke-iront;`

Figure 2 is appl-an view of the under side of the same and Figure 3 is a side elevation of the same. Letters of like kind denote like parts in each iigure. 1 f i 'I he nature and object ofmy improvement relate to l `devices intended for preventing what is termed by` millers the back lash` in mill-spindle drivers; and

The `invent-ion consistsin `the peculiarform, con` struction, and arrangement "offthe spring-boxes; in `connection therewith a detachable plate, to which said `boxes are secured; inproviding each of said boxes withijone or moreIndia-rubber perforated springs; in providing the driver-arms with suitable pins, which enter the holes in said springs; in` also providing the `driver with additional steel springs, tc -act in a direc-A tion opposite to the India-rubber springs, and in the "general.combination and arrangement of its several parts.

Inthe drawings-- i i Arepresents the spindle, of ordinary construction,

"which passes verticallyithrough the horizontal center of thegear-wheel B, which` is constructed with a center piece, radial arms, and an external rim, pro- *vided upon its outsldewith suitable cog-teeth.

The spindle hasupon its lower end a collar, C, which i encircles it, "which collar isadjust-able vertically upon the spindle, by means of a` set-scrcw, a', and isprovided, upon that portion of it which passes through.

the dri-ver, hereinafter described, with a key, b, vertically `"arran ged, `which entersinto a correspudin g slot, o, iirsaid driver.. y

The driver D, through" whose center .the spindle passes vertically, is nearlyfcylindrical in form in its middle portion, and is provided with twoarms (l d, whichextend outwardly toward the. circumference of the wheel B. d f l Each of vthese `arms in turn is provided with a pin,

`e, atl'apoint opposite `the center of the open cud `of l endslof the arms 1gb The springs operate on the sides of the arms opposite to the sides which areprovided with the pins e, above named. f

Upon the wheel B the plate F is placed, which isV circular in form, with the center removed, and with its outer edge coincident at all points with' the bases of the cog-teeth upon the wheel B.

This plate is secured to said wheel B by means of bands or straps j, which embrace opposite radial arms of said wheel, the ends of which straps, passing up through said plate F, are provided with screw-threads 4 said boxes at the same end is cut away, so that the,`

driver-arms may enter into the boxes, the interior fof which they should fit with much nicety.

'The outer end of the spring-boxes is closed. A stud, H, is also, secured to the plate F, hear its outer edge, against, which stud `the outer end of thel spring E presses. The face of this' stud,I which ref ceives the pressure thus indicated, may be provided with an India-rubber cushion. V

The boxes G are provided with one or more Indialubber springs, K, inserted therein, said springs being blocks ot' the shape of the interior of said boxes, and perforated longitudinally in the center. The outerl end of said India-rubber spring should be flush with the open end of the box which contains it.

The operation of this device, andthe purpose of its several parts, are as follows:

The spindle being in position, passing up through the lower millstone, and holding the upper millstone suspended upon it, and motion being imparted to said spindle by means of tlie-driver D, through gears operating the wheel B, the mllstone is rotated with the velocity desired. l

By the use of the India-rubber Aspring K and the 'steel spring E the pressure of the driver-arms is regulated, aud uniformity andsteadiness of motion obtained.

v When the motion of the wheel B islessencd or arrested, the motion of the millstone attached to the spindle is lessened or arrested, without fear of injurious disturbance ofthe connecting machinery.

The object of perforating the India-rubber spri'ngis tolinerease or diminish the strength of the spring to the point desired; the larger the perforation the weaker the spring, and vice versa. The curved shape longitudinally of the boXes has also a tendency' to increase the elasticity of the India rubber.

The use of the pins e, which enter into the perforations ot' the India-rubber springs, is to keep them in position, so that the spring may be uniform.

The steel springs E press the driver-arms continually against the rubber springs, and they in turn press back said arms against the steel springs.

The object of the key b and slot c is that the wheel may be raised out of gear without removing any key, or destroying the relation ot' the driver to the springs. The India-rubber springs may be removed by taking off the steel springs, and so uncovering the ends of the boxes.

The advantage of using several of these springs will be found in the economy of removing the outer ones, when worn, and supplying their places with similar new ones.

I do not wish to coniine myself', in the use of my improvement, to mill-spindle drivers, as it is equally applicable to all shafts or gearing where heavy weights are rotated with velocity.

" Having thus fully set forth the nature., merits, and operation of my device, and the. purpose of' its several parts,

. What I claim 'as my invention, and desire to secure by Letters Patent, is-

1. I-n combination with the spring-boxes G, the perforated India-rubber springs K, constructed as described, and arranged to operate as and for the purpose set forth.

2. The driver'D, provided witharms d d and with pins e, in combination with the India-rubber springs K, when constructed as described, and for the purpose set forth.

3. rIhe combination of the driver D, the steel springs E, the India-rubber springs K, the spindle A, and the gear-wheel B, substantially as described 'and for the purpose set forth.

4. The combination of the gear-wheel' B with the plate F, provided with the spring-boxes G and the studs H, when constructed and arranged to operate as and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 25th day ot February, 1870.

JAMES M. LOGAN.

Witnesses:

Gno. O. Mauer, O. S. Zaun. 

